Abstract: An implant comprising a multi-directional locking mechanism that allows a bone fixation device, such as a screw, to be rigidly affixed to the implant in a plurality of angles relative to the implant. The implant can be a bone plate, a component of a joint prosthesis or the like. The locking mechanism comprises a passage hole in the implant for passage of a bone fixation device therethrough. One or more beam members are arranged adjacent the passage hole and a space is associated with each beam member. Each space allows the associated beam member to move into or about the space upon axial and/or radial deformation of the beam member caused by fastening the bone fixation device to a bone. The beam members and associated elements of the locking mechanism are sufficiently thin to permit axial and/or radial deformation. And said deformation causes the fixation device to be locked in place relative to the implant.

Abstract: An implant comprising a multi-directional locking mechanism that allows a bone fixation device, such as a screw, to be rigidly affixed to the implant in a plurality of angles relative to the implant. The implant can be a bone plate, a component of a joint prosthesis or the like. The locking mechanism comprises a passage hole in the implant for passage of a bone fixation device therethrough. One or more beam members are arranged adjacent the passage hole and a space is associated with each beam member. Each space allows the associated beam member to move into or about the space upon axial and/or radial deformation of the beam member caused by fastening the bone fixation device to a bone. The beam members and associated elements of the locking mechanism are sufficiently thin to permit axial and/or radial deformation. And said deformation causes the fixation device to be locked in place relative to the implant.

Abstract: A pivoting split thread chasing die with fastener is disclosed. In one example, the fastener can include a retainer that captures the fastener within one half of the thread chasing die. The thread chasing die may make it easier for a user to refurbish threads of large bolts and studs.

Abstract: A drill capable of performing high-quality drilling machining on a material which is hard to be cut such as CFRP is provided. The drill includes a drill body 4 having a shank portion 2 at a rear side of the drill main body and a cutting portion 3 at a front side of the drill main body, a first land A to a fourth land D at the cutting portion 3, a first cutting portion groove 5a to a fourth cutting portion groove 5d provided between the lands of the first land A to the fourth land D, a pilot blade 6 formed at the tip of the cutting portion 3, a diameter-enlarging spiral thread portion 9 continuously following the pilot blade 6, a finished spiral thread portion 12 continuously following the diameter-enlarging spiral thread portion 9, a diameter-enlarging spiral blade portion 18, and a finishing spiral blade portion 19.

Abstract: The die has a bore that is generally sized to fit onto a like-sized stud. Threads are formed on the interior of the bore for cutting the threads on the stud. The die includes an integrated alignment mechanism to ensure that the die is aligned with respect to the stud as the die is rotated onto the stud.

Abstract: A spiral spline groove machine apparatus for manufacturing a sealed spiral spline pipe connection by machining spiral grooves into the bell and spigot end of a length of pipe. A rotating cutter is adapted to cut a spiral groove in the inside of the bell of the pipe or machine the recessed external groove on the male end of the pipe. The cutter is adapted to float on the surface contour of the pipe to allow for variations in the wall thickness of the pipe and provide a consistent depth for the cut in the wall of the pipe without regard to the symmetry of the circular cross section of the pipe. An exit port machining device is also disclose to cut an exit port connected to the inside spiral groove on the bell end of the pipe. Another unique aspect of the invention is the use of a rotational to linear converter using a lead screw to move an entire rotating assembly having the motor output fixed directly to the cutter without an expansion joint.

Abstract: A cutting die head that can be set and/or reset without an external mechanism. To this end, the die head includes a die body including a plurality of radially adjustable blocks, each block having a cutter mounted thereon and a radially outwardly facing cam surface. A sleeve surrounds the die body and has an inner surface. The inner surface has a plurality of cam surfaces arranged to communicate with the cam surfaces of the blocks such that axial movement of the sleeve results in radial movement of the blocks. In one embodiment the sleeve is caused to move axially by fluid pressure.

Abstract: A tool for rethreading a damaged threaded object having a solid body with at least one through bore including at least one cutting tooth. A slot intersects the through bore, allowing relief for shavings removed from the object as it is rethreaded. The tool can be adapted to receive a pivot arm to increase the force exerted on the object. Multiple through bores and cutting teeth of varying sizes can be formed in a single tool. The tool may also be adapted to be used in conjunction with taps of varying sizes.

Abstract: The versatility of the present invention is evident in the preferred embodiment that has a driver with a bore extending therethrough from one end, with a cap at the other end. The bore has stepped inner diameters, which preferably contain at least two threaded sections of different diameters. The threaded section with the largest diameter is next to an opening of the bore. Each threaded section thereafter is proximate to a non-threaded space of the same diameter. The capped end can accept a variety of attachments such as a handle, the chuck of a drill bit, or the driver of a ratchet or wrench.

Abstract: A recessed damaged stud re-threading tool including a cylindrical housing having an open lower end, a closed upper end, and a cylindrical side wall therebetween. The open lower end exposes an internal chamber. The cylindrical side wall has a channel extending therethrough downwardly of the closed upper end. A cylindrical thread die is positionable within the internal chamber of the cylindrical housing. The thread die has an open lower end for receiving a stud therein. A first handle is positionable within the channel extending through the cylindrical side wall of the cylindrical housing. The first handle is linear. The first handle has opposed ends exposed in a diametrically opposed relationship with respect to the cylindrical housing.

Abstract: A pivoting split thread chasing die for rethreading and cleaning damaged or inhibited studs or bolts; and a method of manufacturing the die. The identical main body halves of the pivoting split die, when assembled together with an assembly pin form a pivoting split die with opposing front and rear faces and a hexagonal outside periphery. Threads are formed on the inside periphery of the pivoting split die allowing for engagement with the threads of a stud or bolt. One or more material reliefs are formed on the inside periphery of the pivoting split die to enhance the cleaning and rethreading ability of the pivoting split die threads. These reliefs also serve as points for which debris can escape while performing a rethreading procedure. To rethread or clean a damaged or inhibited bolt or stud, apply an appropriate lubricant to the area to be rethreaded or cleaned.

Abstract: A method is provided for machining threads on cylindrical parts, particularly oil country tubular goods, by mounting four thread-cutting chasers in a die head of a thread cutting machine. The thread chasers are each of unique profile, which enables the cutting of threads to close tolerance and decreases metal burrs on the first and last threads cut on the part by reducing the total tool cutting forces imposed on the part and said threading machine.

Abstract: A thread cutting die or chaser for use with a power driven thread cutting machine is provided with a protective coating of an ultra hard material such as titanium nitride which is initially excluded from or is subsequently removed from the faces of the thread cutting teeth such as by a regrinding thereof after application of the coating to the die.

Abstract: A apparatus to orient stock with respect to a threading die. One embodiment of the apparatus detachably mounts to a die and receives and aligns stock prior to its introduction into the threading zone of the die. A second embodiment is an improvement to an extant tool including a die holder having a threading zone, a retaining plate and ratchet adaptor mounted to the retaining plate. The retaining plate alone receives and aligns stock prior to its introduction into the threading zone.

Abstract: The disclosure is directed to a pipe cylindrical thread cutting aid that has an inner cylindrical wall, which extends throughout its length; a pair of outer cylindrical walls between which lies a shoulder which is substantially perpendicular to these outer walls, which are substantially parallel to one another, and leading and trailing surfaces. The thread cutting aid of this invention allows near perfect alignment of the thread cutter with the work piece, permits starting and finishing thread cutting using one hand and permits the thread repair and cutting in close quarters ordinarily not reachable and attainable using prior art thread cutting tools. The thread cutting aid of this invention is particularly well suited for use in the shop where the pipe can be stabilized, e.g., in a vice or equivalent device, and to thread pipe softer than stainless steel or other equivalent steel pipe work piece which are resistant to cutting which occurs during threading, e.g., stainless steel pipe.

Abstract: An adjustable die assembly having a ring structure with a clear central aperture for locating the ring structure along an axial length of a rod to have threads repaired or cut, and having a plurality of thread cutting chaser inserts connected to tool blocks which are slidable radially on said ring, each tool block connected to a threaded adjustment shaft, threaded into said ring for adjusting the radial position of each chaser insert. Alternatively, each threaded adjustment rod can be provided with a pinion gear, and a rim gear can be in mesh with each pinion gear, and a gear device can be provided for turning the rim gear to simultaneously adjust all chasers radially.

Abstract: A spade in a bit body is disclosed to have a planar body shaped with two intersecting cutting faces. The cutting faces extend to side faces defining spade width for cutting a hole to gauge. Inserts positioned in the body are at the comer of the spade. The inserts are formed of very hard material, and provide longer life.

Abstract: A die holder assembly mounts to a conventional lathe for holding a die to facilitate cutting of a thread into a workpiece. The die holder rotatably rides along an alignment shaft which mounts to the chuck of the lathe. The die holder may be manually turned by applying torque via a lever or a wrench while the alignment of the received die is constantly maintained in relation to the workpiece.

Abstract: A rethreading tool (10) for reconditioning and rethreading the threads (62) of a stud (60) is described. The tool includes a moveable jaw (26) having an extension (26A) pivotably mounted into a slot 24 of a fixed jaw (16). The extension and a first portion (16A) of the fixed jaw form a cam surface (40) which is activated by a cam nut (56) to move the moveable jaw toward the fixed jaw after positioning of the tool around the stud. Upon closing, the jaws form a complete circular opening (42) which contains a complete circular thread die (48) formed from a first thread die (22) in the fixed jaw and a second thread die (46) in the moveable jaw. In use, the tool is placed over the threads of the stud and the jaws are moved into the closed position such that the complete thread die is adjacent the threads of the stud. The tool is then rotated off of the stud.

Abstract: A method for using a die holder with centering and squaring guide to cut preliminary and final threads on rotatable stationary workpieces is provided and includes a locating pin, a die with set screw, a shim, a die holder with two lock screws, a guide, three bolts, a guide bushing and a gage. The guide bushing presents alot more surface area to guide the workpiece into the die and which holds the workpiece absolutely square to the die throughout operation of making a machine quality thread on the workpiece.

Abstract: A threading device which can cut a uniform and symmetrical screw thread in the outer surface of a round bar or tube includes a die nut having internal cutting threads and two axial holes and a guide ring which includes two axial roll pins extending away from a rear face thereof and which are capable of extending into the axial holes in the die nut without play to align the axis of the guide ring with the axis of the die nut. The guide ring will act to maintain the axis of the die nut coaxial with the axis of a round bar or tube which extends through the bore of the guide ring and contacts the cutting threads in the die nut. The die nut (together with the guide ring) can be manually rotated to cut a screw thread in a round bar or tube by means of a conventional wrench.

Abstract: A threading or rethreading die made up of a plurality of complementary separable interfitting parts held together by a tension spring disposed around the exterior surface thereof which in use are separated from one another under the tension of the spring thereby enabling the die to be passed over a member to be threaded or rethreaded whereat the separating force is relaxed permitting the parts to re-engage on the member. The die is then turned to effect the cutting of the threads.

Abstract: The present invention relates to a device for cutting a thread on a railroad spike. The device employs tangential chasers which are designed to form a thread on a cylindrical portion and a tapering portion of the shank. The chasers form a thread having a constant pitch, root and crest diameter. The chasers are also designed to provide a gap of constant length between the forward flank of a thread on one turn and the rearward flank of the thread on an adjacent turn.

Abstract: Chaser for cutting threads on a work piece, the chaser having thread cutting formations with crests and roots, one flank of each of said formations being relieved at a first angle from the region of the crest toward the root and being relieved at a greater angle in the region adjacent the root of the formation. The chasers may be provided in sets with odd numbered chasers being mirror images of the even numbered chasers.

Abstract: A tool for cutting external threads in the form of a round die having a housing with thread chasers arranged at its end and extending toward the interior of the housing. The housing has the form of an annulus with an inside diameter greater than the diameter of thread chaser blades by the height of the thread chaser.

Abstract: A device for rethreading and cleaning threaded pipe studs having an elongated casing having an outside surface provided with flat portions for attaching to a torquing means, which casing is provided with a straight channel therethrough shaped to allow passage of the pipe stud with at least a portion of the channel sidewalls having an inside diameter slightly larger than the outside diameter of the pipe studs, and having multiple threading dies attached to the channel sidewalls at one open end with the teeth protruding perpendicularly from the channel sidewalls, wherein the teeth on each threading die projects consecutively shallower into the channel as they progress from the open end.

Abstract: This invention relates to an improved self-threading unit which can be utilized to hold a replacement shock absorber within the cylindrical shroud of a vehicular suspension system commonly referred to as a MacPherson strut suspension assembly. The nut includes a generally cylindrical main body portion having a tapered thread forming portion on the inner wall thereof. The thread forming portion is adapted to roll form buttress-type threads on the upper end of the cylindrical shroud. The upper end of the main body portion includes a top wall having an annular bushing mounted therein for receiving the shock absorber piston rod and centering the nut as it is rotated onto the cylindrical shroud. The top wall is provided with channels extending radially outwardly from the bushing such that, in the event the shock absorber bottoms out, any liquid which may have accumulated on the top wall of the nut, will be evacuated outwardly and will not be forced into the shroud through the bushing.

Abstract: The invention comprises an improved rethreading die, a method of making the die, and a method of rethreading an in situ stud member. The workpiece from which the die is formed has oppositely directed front and rear faces and laterally outwardly facing side surfaces about the periphery of the front and rear faces. Recesses are formed in said workpiece for receipt of a hinge and its retaining pins. The hinge and pins are fitted in the recesses in the workpiece. The hinge and pins are removed, and the workpiece is divided, generally transversely with respect to the front and rear faces, into a pair of die members. The hinge and pins are then replaced in their recesses in engagement with positioning reference surfaces formed by those recesses. The die members thus formed and hingedly connected each have a first end, the first ends being disposed generally adjacent each other to one side of an inner opening formed prior to splitting of the workpiece.

Abstract: A tapered thread cutting machine includes a multi-part rotary machining head, one part including a through-recess and another being a separable interior wear plate. Interacting chaser holders are mounted in the recess and include angled V-shaped slots in which block type chasers may be secured between clamps and locating pins enabling the chasers to be removed and replaced without removing the holders from the recess. The holders are driven by a linear cam for opening and closing movement through a thrust block mounted on a guide rod, such thrust block being fitted in a slot in one holder but otherwise not secured thereto so that binding in the opening and closing of tool holders is minimized.

Abstract: A boring reamer with end mill cutters comprising a cutting edge portion, a straight shank and a taper shank. The cutting edge portion is formed at the forward edge of the straight shank, and has, at its forward end, end mill cutters each of which is formed with a chamfer angle portion and a relieving angle portion, and has a reamer, which is slightly larger in the diameter than the end mill cutters and provided with an ultra-left-hand twist right-hand helix angle, and which is formed into a saw-tooth like configuration having a land portion.

Abstract: This invention relates to a self-threading nut which is utilized to hold a replacement shock absorber within the cylinder housing of a vehicular suspension system commonly referred to as a MacPherson strut suspension system. The nut includes a generally cylindrical main body portion having a tapered threaded portion on the inner wall thereof. A plurality of apertures are formed in the side wall of the main body portion to provide positive lead angle cutting edges and permit the removal of metal chips therefrom. The lower end of the nut is formed with an inner diameter corresponding to the outer diameter of the cylinder, and the upper end wall includes a plastic bushing having an inner diameter corresponding to the diameter of the piston rod of the replacement shock absorber. The inner diameter of the lower end and the plastic bushing cooperate to center the nut as threads are formed on the outer wall of the cylinder.

Abstract: A chip breaker includes an abutment surface having geometry generally corresponding in profile to the geometry on the cutting edge of the associated thread chaser to permit such abutment surface to be uniformly spaced from respective roots and crests of the thread chaser and in close proximity thereto when the chaser and breaker are clampingly juxtaposed. The juxtaposed or trailing surface of the chip breaker has angularly biased, parallel grooves therein to deliver coolant past the chaser body and then into the cutting area along the respective flanks of the chip breaker and chaser geometry.

Abstract: A combination tap and die wrench is provided having a center portion with an aperture extending through the thickness thereof for receiving and retaining tapping apparatus and at least two oppositely extending arm portions extending outwardly from the center portion, each of said arm portions including a plurality of receptacles for receiving and retaining dies. An extension handle is also provided and may be secured to either of the arm portions at their outwardly extending ends. Storage means for tapping apparatus may be provided in the handle.

Abstract: Holder for a threading die. A die holder is provided for threading elongated items of circular cross section, particularly pipe or rod, which can utilize dies of either hexagonal or circular external contour, which can be arranged to reach otherwise awkward places, which can be rotated either by a wrench or by handles and which under certain conditions of use permits a long article such as rod material to pass entirely therethrough. A generally tubular body part has a recess, preferably hexagonal, in one end thereof for the reception of either a hexagonal or a circular die. If a circular die is used, same can be held in position by a set screw. The other end of said body member is externally contoured for receiving a wrench and has an end opening of normally rectangular cross section which is on a common center with the axis of said die. Thus, said die holder can be rotated by a wrench either directly on said last-named end thereof or through an extension inserted into said rectangular opening.